xml与Java相互转换的例子.doc

package util;import java.io.FileInputStream;import java.io.FileOutputStream;import java.util.ArrayList;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import entity.Emp;/* *员工XML解析器 */public class EmpXmlParser /* * 1.写XML，将员工数据写入到emp.xml中 */public static void emp2xml() throws Exception /模拟员工数据Emp e = new Emp();e.setId(1);e.setName(张三);e.setAge(25);e.setSalary(6000.00);e.setType(simple);/创建文档对象Document doc = DocumentHelper.createDocument();/创建根元素Element root = doc.addElement(emp);/在根元素下创建各子元素root.addElement(id).addText(e.getId().toString();root.addElement(name).addText(e.getName();root.addElement(age).addText(e.getAge().toString();root.addElement(salary).addText(e.getSalary().toString();/创建根元素的属性root.addAttribute(type, e.getType();/将文档对象输出XMLWriter writer = new XMLWriter(new FileOutputStream(d:xmlemp.xml),OutputFormat.createPrettyPrint();writer.write(doc);writer.close();/* * 2.读取XML，将数据写入Emp对象中 */public static void xml2emp() throws Exception SAXReader reader = new SAXReader();/读取xmlDocument doc = reader.read(new FileInputStream(d:xmlemp.xml);Emp e = new Emp();/读取根元素Element root = doc.getRootElement();/读取根元素的下级元素e.setId(Integer.valueOf(root.elementText(id);e.setName(root.elementText(name);e.setAge(Integer.valueOf(root.elementText(age);e.setSalary(Double.valueOf(root.elementText(salary);/读取根元素的属性e.setType(root.attributeValue(type);System.out.println(ID: + e.getId();System.out.println(Name: + e.getName();System.out.println(Age: + e.getAge();System.out.println(Salary: + e.getSalary();System.out.println(Type: + e.getType();/* * 将一组Emp数据写入到一个XML文件中 */public static void emps2xml() throws Exception List emps = new ArrayList();Emp e1 = new Emp();e1.setId(1);e1.setName(张三);e1.setAge(25);e1.setSalary(6000.00);e1.setType(simple);emps.add(e1);Emp e2 = new Emp();e2.setId(2);e2.setName(李四);e2.setAge(26);e2.setSalary(7000.00);e2.setType(simple);emps.add(e2);Emp e3 = new Emp();e3.setId(3);e3.setName(王五);e3.setAge(27);e3.setSalary(8000.00);e3.setType(Leader);emps.add(e3);Document doc = DocumentHelper.createDocument();/创建根元素Element root = doc.addElement(emps);for(Emp emp : emps)Element parent = root.addElement(emp);parent.addElement(id).addText(emp.getId().toString();parent.addElement(name).addText(emp.getName();parent.addElement(age).addText(emp.getAge().toString();parent.addElement(salary).addText(emp.getSalary().toString();parent.addAttribute(type, emp.getType();/输入到XMLXMLWriter writer = new XMLWriter(new FileOutputStream(d:xmlemps.xml),OutputFormat.createPrettyPrint();writer.write(doc);writer.close();/* * 4.从XML中读取一组Emp数据 */public static void xml2emps() throws Exception SAXReader reader = new SAXReader();List emps = new ArrayList();/读取XML文件Document doc = reader.read(new FileInputStream(d:xmlemps.xml);/读取根元素empsElement root = doc.getRootElement();List elems = root.elements(emp);for(Element elem : elems)Emp e = new Emp();e.setId(Integer.valueOf(elem.elementText(id);e.setName(elem.elementText(name);e.setAge(Integer.valueOf(elem.elementText(age);e.setSalary(Double.valueOf(elem.elementText(salary);e.setType(elem.attributeValue(type);emps.add(e);for(Emp e : emps)System.out.println(e.getId() + +e.getName();/* * xpath演示示例 */public static void xpath() throws Exception SAXReader reader = new SAXReader();Document doc = reader.read(new FileInputStream(d:xmlemps.xml);/List elems = /doc.selectNodes(/emps/emp1);/List elems = /doc.selectNodes(/emps/emptype=Leader);List elems = doc.selectNodes(/emps/empid=2);Element parent = elems.get(0);Sys